
Set the seal on something
Definitive Moments
Use when an action emphasizes the completion or success of something important.

Her brilliant performance set the seal on her reputation as a great actress.
Not Literal
It's a metaphorical phrase and doesn't involve an actual seal or stamping action.

Winning that award set the seal on his hard work.
Emphasizing Result
It highlights that a certain outcome is now definite or assured.

Signing the contract set the seal on the company's merger.
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